CN209878878U - AC/DC signal power integrated measuring device - Google Patents
AC/DC signal power integrated measuring device Download PDFInfo
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- CN209878878U CN209878878U CN201920224159.XU CN201920224159U CN209878878U CN 209878878 U CN209878878 U CN 209878878U CN 201920224159 U CN201920224159 U CN 201920224159U CN 209878878 U CN209878878 U CN 209878878U
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Abstract
The utility model discloses an AC/DC signal power integrated measuring device, which is used for outputting the power of an input signal which is an AC/DC signal, and comprises a voltage sampling circuit, a current sampling circuit, a hysteresis comparison circuit, an A/D conversion module and a controller; the voltage sampling circuit is used for collecting a voltage signal of an input signal; the current sampling circuit is used for collecting a current signal of an input signal; the hysteresis comparison circuit is used for judging the type of the input signal; the A/D conversion module is used for converting the analog voltage and current signals into digital signals; the voltage sampling circuit is respectively connected with the hysteresis comparison circuit and the A/D conversion module, the current sampling circuit is connected with the A/D conversion module, and the hysteresis comparison circuit and the A/D conversion module are respectively connected with the controller. The utility model discloses a to the sampling of input signal voltage and electric current to and adopt hysteresis comparison circuit to judge the type of input signal, realize the measurement to handing over/direct current signal power.
Description
Technical Field
The utility model belongs to trade/DC signal power measurement field, concretely relates to trade/DC signal power integration measuring device.
Background
The field of power signal measurement mostly adopts split type devices, namely an alternating current power measuring device can not be applied to the field of direct current measurement, and a direct current measuring device can not be applied to the field of alternating current measurement; in some application places where alternating current and direct current exist, two devices are required to be interchanged to carry out measurement, so that the use difficulty and the equipment cost are increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the problem and not enough that above-mentioned exists, provide a simple structure, measuring method is simple and easy, measurement accuracy is high, with low costs friendship/direct current signal power integration measuring device.
In order to realize the purpose, the utility model discloses a technical scheme is: an AC/DC signal power integrated measuring device comprises a voltage sampling circuit, a current sampling circuit, a hysteresis comparison circuit, an A/D conversion module and a controller;
the voltage sampling circuit is used for collecting a voltage signal of an input signal; the voltage sampling circuit comprises a voltage reduction unit and a level lifting unit which are sequentially connected, wherein the voltage reduction unit is used for reducing the voltage of an input signal, the level lifting unit is used for lifting the reference zero level of the input signal after voltage reduction to a reference voltage position from a zero value, and the value of the reference voltage is the central value of the input range of the A/D conversion module;
the current sampling circuit is used for collecting a current signal of an input signal;
the hysteresis comparison circuit is used for judging the type of the input signal; one input end of the hysteresis comparison circuit is connected with the voltage signal output by the voltage sampling circuit, the other input end of the hysteresis comparison circuit is connected with reference voltage, the reference voltage value is the same as the reference voltage value, and the hysteresis comparison circuit outputs a judgment signal;
the A/D conversion module is used for converting analog signals output by the voltage sampling circuit and the current sampling circuit into digital signals;
and the controller is used for receiving the judgment signal and the voltage signal and the current signal in a digital form and respectively outputting power signals of an alternating current/direct current signal.
Further perfecting the technical scheme, the voltage reduction unit comprises a resistance voltage division circuit and a power supply, the resistance voltage division circuit is arranged between two input ends of an input signal, the negative end of the input signal is connected with the power supply, and the power supply value is the same as the reference voltage value;
the level lifting unit adopts a reverse proportion amplifying circuit and comprises a first amplifier, the homodromous input end of the first amplifier is connected with reference voltage, and the output of the first amplifier is a sampling voltage signal. The resistance voltage-dividing circuit is adopted to reduce the voltage of the input signal so as to meet the amplitude requirement of the subsequent current; the reference voltage is adopted to improve the level of the input signal, so that the sampling of the A/D conversion module and the comparison of the hysteresis comparison circuit are facilitated.
Furthermore, the current sampling circuit adopts a differential amplification circuit and comprises a second amplifier, the homodromous input end of the second amplifier is connected with a reference voltage, and the output of the second amplifier is a sampling current signal. The amplifier is adopted to amplify and level-lift the input current signal, thereby being convenient for sampling of the A/D conversion module and ensuring the sampling precision.
Further, the voltage input range of the A/D conversion module is 0-5V, and the reference voltage value is 2.5V. And setting the reference voltage value as a midpoint value of a voltage input range of the A/D conversion module to ensure that all current and voltage signals can be sampled and ensure the sampling accuracy.
Further, the power monitoring device also comprises a display module which is connected with the controller and is used for displaying the power signal output by the controller. And a display module is arranged to intuitively and clearly display the power value.
The utility model has the advantages that: the utility model discloses a voltage sampling circuit and current sampling circuit sample the input signal to adopt the hysteresis comparison circuit to judge the type of input signal, thereby measure the power of handing over/direct current signal respectively, realized handing over/direct current signal's integration and measure, device overall structure is simple, design benefit, measurement accuracy height, it is with low costs. The utility model discloses a carry out signal sampling with the mode of input signal promotion certain level to judge input signal's type through hysteresis comparison circuit, thereby calculate the power of handing over/direct current signal respectively, measuring method is simple and easy convenient.
Drawings
Fig. 1 is a structural diagram of the integrated ac/dc signal power measuring device of the present invention;
FIG. 2 is a circuit diagram of the voltage sampling circuit of FIG. 1;
FIG. 3 is a circuit diagram of the current sampling circuit of FIG. 1;
FIG. 4 is a circuit diagram of the hysteresis comparator circuit of FIG. 1;
Detailed Description
In order to make the contents of the present invention clearer, the following describes in detail the embodiments of the present invention with reference to the attached drawings. It should be noted that for the sake of clarity, the figures and the description omit representation and description of parts known to those skilled in the art that are not relevant to the inventive concept.
Example 1:
the utility model provides an alternating current/direct current signal power integrated measuring device, input signal is alternating current/direct current signal, as shown in figure 1, including voltage sampling circuit, current sampling circuit, hysteresis comparison circuit, AD conversion module and controller;
the voltage sampling circuit is used for collecting a voltage signal of an input signal; the voltage sampling circuit comprises a voltage reduction unit and a level lifting unit which are sequentially connected, wherein the voltage reduction unit is used for reducing the voltage of an input signal, the level lifting unit is used for lifting the reference zero level of the input signal after voltage reduction to a reference voltage position from a zero value, and the value of the reference voltage is the central value of the input range of the A/D conversion module;
the current sampling circuit is used for collecting a current signal of an input signal;
the hysteresis comparison circuit is used for judging the type of the input signal; one input end of the hysteresis comparison circuit is connected with the voltage signal output by the voltage sampling circuit, the other input end of the hysteresis comparison circuit is connected with reference voltage, the reference voltage value is the same as the reference voltage value, and the hysteresis comparison circuit outputs a judgment signal;
the A/D conversion module is used for converting analog signals output by the voltage sampling circuit and the current sampling circuit into digital signals;
and the controller is used for receiving the judgment signal and the voltage signal and the current signal in a digital form and respectively outputting power signals of an alternating current/direct current signal.
The display module is connected with the controller and used for displaying the power signal output by the controller.
As shown in fig. 2, the voltage dropping unit includes a resistance voltage dividing circuit and a power supply, the resistance voltage dividing circuit is disposed between two input ends of the input signal, a negative end of the input signal is connected to the power supply, and a value of the power supply is the same as a reference voltage value. Specifically, the resistance voltage division circuit comprises resistors R1, R2, R3 and a switch K1, the resistors R1, R2 and R3 form a series-parallel voltage division circuit, the switch K1 controls the on-off of branches of the resistors R2 and R3, the positive pole VP of an input signal is connected to the resistor R1, the negative pole of the input signal is connected with the switch K1 and a power supply, and the power supply value is 2.5V; the output of the resistance voltage-dividing circuit is connected with the capacitor C1 and then grounded, and the output signal of the voltage-reducing unit is voltage V'.
The level lifting unit adopts a reverse proportion amplifying circuit and comprises a first amplifier, the homodromous input end of the first amplifier is connected with reference voltage, and the output of the first amplifier is a sampling voltage signal. Specifically, the model of the first amplifier is MCP602, the equidirectional input end of the first amplifier is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a reference voltage V0, and since the input voltage range of the a/D conversion module is 0-5V, the value of the reference voltage V0 is set to 2.5V, so as to ensure that the a/D conversion module can acquire all input signals; a resistor R4 is arranged between the output voltage V' of the voltage reduction unit and the reverse input end of the first amplifier, and a resistor R6 is arranged between the output end and the reverse input end of the first amplifier; the output of the first amplifier is connected with the capacitor C2 and then grounded, and the voltage sampling circuit outputs a sampling voltage signal VI. The working principle of the voltage sampling circuit is as follows: if the switch K1 is placed at the right side, the branch with the resistor R3 is switched onAndcalculating to obtain: VI ═ 2.5-1.2 (VP-VN); similarly, if the switch K1 is placed on the left side and the resistor R2 branch is turned on, VI is 2.5-2.4/31 (VP-VN). In sum, the voltage sampling circuit reduces the voltage of the input signal and then improves a certain level for output.
As shown in fig. 3, the current sampling circuit adopts a differential amplification circuit, and includes a second amplifier, a reference voltage is connected to a same-direction input end of the second amplifier, and an output of the second amplifier is a sampling current signal. Specifically, the system further comprises resistors R7, R8, R9 and R10 and a capacitor C3, wherein the model of the second operational amplifier is MCP 602; the voltage between VN and VN-CT is a micro voltage signal converted by current of an input signal after passing through a sampling resistor, a resistor R7 is arranged between VN and the same-direction input end of the second amplifier, a resistor R8 is arranged between VN-CT and the reverse input end of the second amplifier, the same-direction input end of the second amplifier is connected with one end of a resistor R9, the other end of the resistor R9 is connected with a 2.5V power supply, a resistor R10 is arranged between the output end and the reverse input end of the second amplifier, the output of the second amplifier is connected with a capacitor C3 and then grounded, and the output of the current sampling circuit is a current signal UAI. Wherein, UAI＝47(VVN-VVN_CT) +2.5 (V). Therefore, the current sampling circuit amplifies the current of the input signal and then boosts a certain level for output.
As shown in fig. 4, the hysteresis comparison circuit adopts a voltage comparator, and includes a third amplifier, where the model of the third amplifier is TLV2374, an inverting input terminal of the third amplifier is connected to the sampled voltage signal VI, a non-inverting input terminal of the third amplifier is connected to one end of a resistor R11, the other end of the resistor R11 is connected to a reference voltage, and the value of the reference voltage is 2.5V; a resistor R12 is arranged between the output end of the third amplifier and the same-direction input end, and the third amplifier outputs a judgment signal to the controller. When the input signal is a direct current signal, the sampling voltage signals VI are all smaller than the reference voltage 2.5V, and the hysteresis comparison circuit outputs a high level signal; when the input signal is an alternating current signal, the hysteresis comparison circuit outputs a periodic square wave signal.
The working principle of the utility model comprises the following steps:
s1: the voltage sampling circuit collects the voltage of an input signal: reducing the voltage of an input signal, and collecting an output voltage signal after superimposing a reference voltage of a direct current component;
the current sampling circuit collects the current of an input signal: amplifying the current of an input signal, and collecting an output current signal after superimposing a reference voltage of a direct current component;
s2: and (3) judging the type of the input signal by adopting a hysteresis comparison circuit: the value of the reference voltage of the hysteresis comparison circuit is the same as the reference voltage value, and the voltage signal collected in S1 is compared with the reference voltage to judge the type of the input signal; if the hysteresis comparison circuit outputs a periodic square wave signal, the input signal is an alternating current signal; if the hysteresis comparison circuit outputs a constant signal, the input signal is a direct current signal;
s3: and respectively calculating the power of the alternating current/direct current signals according to the type of the input signal, the voltage signal and the current signal. When the input signal is judged to be a direct current signal, subtracting the boosted reference voltage, and then calculating the power; and when the input signal is judged to be the alternating current signal, subtracting the superposed reference voltage, and calculating the power factor of the alternating current signal by adopting an FFT algorithm.
The above description is only intended to illustrate the embodiments of the present invention, and the description is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the inventive concept, several variations and modifications can be made, which all fall within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. An alternating current/direct current signal power integration measuring device which is characterized in that: the circuit comprises a voltage sampling circuit, a current sampling circuit, a hysteresis comparison circuit, an A/D conversion module and a controller;
the voltage sampling circuit is used for collecting a voltage signal of an input signal; the voltage sampling circuit comprises a voltage reduction unit and a level lifting unit which are sequentially connected, wherein the voltage reduction unit is used for reducing the voltage of an input signal, the level lifting unit is used for lifting the reference zero level of the input signal after voltage reduction to a reference voltage position from a zero value, and the value of the reference voltage is the central value of the input range of the A/D conversion module;
the current sampling circuit is used for collecting a current signal of an input signal;
the hysteresis comparison circuit is used for judging the type of the input signal; one input end of the hysteresis comparison circuit is connected with the voltage signal output by the voltage sampling circuit, the other input end of the hysteresis comparison circuit is connected with reference voltage, the reference voltage value is the same as the reference voltage value, and the hysteresis comparison circuit outputs a judgment signal;
the A/D conversion module is used for converting analog signals output by the voltage sampling circuit and the current sampling circuit into digital signals;
and the controller is used for receiving the judgment signal and the voltage signal and the current signal in a digital form and respectively outputting power signals of an alternating current/direct current signal.
2. The integrated ac/dc signal power measuring device according to claim 1, wherein: the voltage reduction unit comprises a resistance voltage division circuit and a power supply, the resistance voltage division circuit is arranged between two input ends of an input signal, the negative end of the input signal is connected with the power supply, and the power supply value is the same as the reference voltage value;
the level lifting unit adopts a reverse proportion amplifying circuit and comprises a first amplifier, the homodromous input end of the first amplifier is connected with reference voltage, and the output of the first amplifier is a sampling voltage signal.
3. The integrated ac/dc signal power measuring device according to claim 1, wherein: the current sampling circuit adopts a differential amplification circuit and comprises a second amplifier, the homodromous input end of the second amplifier is connected with reference voltage, and the output of the second amplifier is a sampling current signal.
4. The integrated ac/dc signal power measuring device according to claim 2 or 3, wherein: the voltage input range of the A/D conversion module is 0-5V, and the reference voltage value is 2.5V.
5. The integrated ac/dc signal power measuring device according to claim 1, wherein: the display module is connected with the controller and used for displaying the power signal output by the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920224159.XU CN209878878U (en) | 2019-02-22 | 2019-02-22 | AC/DC signal power integrated measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920224159.XU CN209878878U (en) | 2019-02-22 | 2019-02-22 | AC/DC signal power integrated measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN209878878U true CN209878878U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920224159.XU Active CN209878878U (en) | 2019-02-22 | 2019-02-22 | AC/DC signal power integrated measuring device |
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| CN (1) | CN209878878U (en) |
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